This may seem a bit boring perhaps, just placing the loreful lord of Tlaxtlan in his own city. But honestly given the current setup of starting positions for all parties involved, it is the start that makes the most sense for him in the end. Think about it, there is not really that much room, or for that matter even a point, to setting up another Lizardmen start outside of Lustria. We already have 4 other Lizardmen dispatched to various spots around the world, while we only have 3 inside of Lustria itself. Of course, there are other regions devoid of Lizardmen currently, but I think its unlikely that we'll see a Lizardmen addition to them. You're not gonna stick Tetto'eko into the Dark Lands or Mountains of Mourn, that's territory held for future Ogre/Greenskin/Chaos Dwarf/Dwarf additions. Same thing for the Chaos Wastes (but for Daemons/Warriors of course) and besides, that is Oxyotl's gig. What little free land there is in the Empire and Norsca are also similar holding places. Barring any sort of expansion into Ind or Khuresh, that leaves Naggaroth and Lustria. And while Tretch has moved to Crookback, Naggaroth still remains rather crowded and besides, putting Tetto'eko somewhere in middle Naggaroth would probably create an alliance triangle with Alith Anar and the Sisters which would threaten to steamroll the Dark Elves in their own home, especially with Mazdamundi distracting Morathi in the south as well.
And then there is Lustria, which I say in IE is a lot more open than before. Teclis has moved to the Southlands and Lokhir away to Cathay. This opens Lustria up, especially in the north-central parts. And placing Tetto'eko here now would make quite the campaign actually. Your immediate problem would be The Marshall That Must Not Be Named
and the newly self-appointed Lord of Bregonne, who would be directly on your northern and eastern borders. You need to push out those invaders quickly enough to then swing around and help Gor-Rok against Luthor Harkon and the Skaven. And hey, maybe CA decides to put some other invader on the western coast as well, either now or further down the line.What do you think guys? Where would you place Tetto'eko in Immortal Empires?